.demo-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    width: 44px;
    height: 44px;
    background: var(--hde-card-bg);
    color: var(--hde-ink);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
    box-shadow: 0 25px 50px 0px rgba(0,0,0,0.05);
}

.demo-fab:hover {
    color: var(--hde-ink);
}

.demo-fab svg {
    width: 22px;
    height: 22px;
    transition: transform 0.4s ease;
}

.demo-fab svg {
    stroke-width: 1.75;
}

.demo-fab.is-open svg {
    transform: rotate(90deg);
}

.demo-fab.demo-no-transition,
.demo-panel.demo-no-transition {
    transition: none !important;
}

.demo-panel {
    position: fixed;
    bottom: 100px;
    right: 30px;
    z-index: 9999;
    width: 300px;
    max-width: calc(100vw - 40px);
    max-height: 71vh;
    background: var(--hde-card-bg);
    border-radius: 14px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.10);
    display: flex;
    flex-direction: column;
    transform: translateY(20px) scale(0.96);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s cubic-bezier(0.34,1.56,0.64,1), opacity 0.2s ease;
    overflow: hidden;
}

.demo-panel.is-open {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
}

.demo-panel-header {
    display: flex;
    align-items: center;
    padding: 18px 18px;
    border-bottom: 1px solid var(--hde-border);
    flex-shrink: 0;
}

.demo-panel-header-icon img {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.demo-panel-header-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.demo-panel-header-icon svg {
    width: 16px;
    height: 16px;
}

.demo-panel-header-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.demo-panel-header-text h3 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--hde-ink);
    line-height: 1.2;
    margin: 0;
}

.demo-panel-header-text p {
    font-size: 1.2rem;
    color: var(--color-secondary-text);
    line-height: 1.3;
    font-weight: 400;
}

.demo-panel-body {
    overflow-y: auto;
    flex: 1;
}

.demo-panel-body::-webkit-scrollbar {
    width: 4px;
}

.demo-panel-body::-webkit-scrollbar-track {
    background: transparent;
}

.demo-panel-body::-webkit-scrollbar-thumb {
    background: #ddd;
    border-radius: 4px;
}

.demo-link {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 10px 18px;
    text-decoration: none;
    transition: background 0.15s;
}

.demo-link:hover {
    background: color-mix(in srgb, var(--hde-ink) 4%, transparent);
}

.demo-link-label {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--hde-ink);
}

.demo-link-desc {
    font-size: 1.2rem;
    color: var(--color-secondary-text);
    line-height: 1.3;
    font-weight: 400;
}

.demo-panel-footer {
    flex-shrink: 0;
    padding: 18px 18px;
    border-top: 1px solid var(--hde-border);
}

.demo-purchase-btn {
    display: block;
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: var(--ghost-accent-color);
    color: var(--hde-card-bg);
    font-size: 1.3rem;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    box-sizing: border-box;
}

.demo-purchase-btn:hover {
    opacity: 0.9;
}

@media (max-width: 480px) {
    .demo-fab {
        bottom: 20px;
        right: 20px;
    }
    .demo-panel {
        bottom: 76px;
        right: 20px;
    }
}